// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package stats

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestCalc(t *testing.T) {
	vals := Float64Values{20.5, 13, 74, 98, 12, 76.4, 264, 201, 98, 30, 16, 12}
	a := Calc(vals)
	assert.Equal(t, Statistics{
		Min:    12,
		Max:    264,
		Mean:   76.24166666666666,
		Count:  12,
		Sum:    914.9,
		StdDev: 81.4067839292093,
	}, a)
}

func TestMergeAggregations(t *testing.T) {
	statistics := Merge([]Statistics{
		Calc(Float64Values{20.5, 13, 74, 98}),
		Calc(Float64Values{12, 76.4, 264, 201}),
		Calc(Float64Values{98, 30, 16, 12}),
		Statistics{
			Count: 0,
		},
	})
	assert.Equal(t, Statistics{
		Min:    12,
		Max:    264,
		Mean:   76.24166666666666,
		Count:  12,
		Sum:    914.9,
		StdDev: 86.30370872036085,
	}, statistics)
}

func TestMergeEmptyAggregations(t *testing.T) {
	statistics := Merge([]Statistics{
		Statistics{Count: 0},
		Statistics{Count: 0},
	})
	assert.Equal(t, Statistics{}, statistics)
}
